har har
9/12/2008 10:37:33 PM
wat
9/12/2008 11:17:15 PM
physics!
9/12/2008 11:25:40 PM
http://www.cnn.com/2008/US/09/12/train.collision/index.html
9/12/2008 11:31:38 PM
The key is to ADD their velocities together since they are heading in the same direction
9/12/2008 11:45:17 PM